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Effects of strain hardenability and strain-rate sensitivity on the plastic flow and deformation homogeneity during equal channel angular pressing

Published online by Cambridge University Press:  26 November 2012

Hyoung Seop Kim
Affiliation:
Department of Metallurgical Engineering, Chungnam National University, Taejon 305–764, Korea
Sun Ig Hong
Affiliation:
Department of Metallurgical Engineering, Chungnam National University, Taejon 305–764, Korea
Min Hong Seo
Affiliation:
Department of Metallurgical Engineering, Chungnam National University, Taejon 305–764, Korea
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Abstract

The effects of strain hardenability and strain rate sensitivity on the plastic flow and deformation inhomogeneity during equal channel angular pressing were studied using a finite element method analysis. In this study, perfect plastic nonhardening and rate-insensitive materials, and rate-sensitive materials were considered. In case of the nonhardening and rate-insensitive materials, the deformed geometry was predicted to be quite uniform and homogeneous. Deformation inhomogeneity developed, however, in materials with finite work-hardening exponent and strain-rate sensitivity. The corner gap formed in strain-hardening materials whereas the upper and lower channel gaps formed in strain-rate-sensitive materials. The deformation inhomogeneity was strongly dependent on the relative effects of strain-hardening exponent and strain-rate sensitivity. The predictions on the deformation inhomogeneity and the formation of corner and channel gaps were compatible with the experimental data published in the literature.

Type
Articles
Copyright
Copyright © Materials Research Society 2001

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